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Altitude sickness on the Everest trek: the simple rules that keep you safe

Altitude — not the walking — is the real challenge of an Everest trek. Here are the proven rules, and the warning signs, every trekker should know before 2026.

LR 作者 Laxman Rawal · 2026年6月16日 · 2 分钟阅读 · 更新于 2026年6月17日

High-altitude terrain on the Everest Base Camp trek, Nepal

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Here is the truth most first-time trekkers underestimate: the hard part of the Everest Base Camp trek is not the distance or the steepness — it is the thin air. Above 3,000 metres your body has to adapt to roughly half the oxygen it is used to, and rushing that process is what makes people sick. The good news is that altitude sickness is largely preventable if you follow a few well-proven rules.

Know the basics

Symptoms of mild AMS: headache, nausea, poor sleep, fatigue
The golden rule: climb high, sleep low, and ascend slowly
Build in acclimatisation days (Namche, Dingboche on the EBC route)
If symptoms worsen, the only sure cure is to descend

The rules that work

Acclimatisation is not optional — it is the whole game. Above about 3,000m, aim to raise your sleeping altitude only gradually each day, and take rest days where the classic itineraries put them (a good Everest trek schedules acclimatisation days at Namche Bazaar and Dingboche for exactly this reason). Hydrate hard, walk slowly, eat well, and never ignore a worsening headache. Many trekkers carry acetazolamide (Diamox) as a preventive — discuss it with your doctor. Above all, respect the mountain's timetable, not your own.

Altitude rules for the Everest trek
Rule	Why it matters
Ascend slowly above 3,000m	Gives your body time to adapt
Climb high, sleep low	Trains the body without overnight stress
Take acclimatisation days	Namche & Dingboche exist for this
Descend if it gets worse	The one reliable cure for serious AMS

What this means for you

You do not need to fear altitude — you need to respect it. Our Everest itineraries are built with the right acclimatisation days and guides trained to spot early symptoms, so you ascend at a pace your body can handle. Choose a properly paced trek, and the thin air becomes a challenge you are ready for, not a gamble.

Source: Travel Himalaya Nepal.

Cover photo: Nepal Trek Adventures via Wikimedia Commons (CC BY-SA 4.0).

来源： Travel Himalaya Nepal

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